What version of More Mystcraft are you using?
moremystcraft-1.12.2-0.5.5.jar

What version of Mystcraft are you using?
mystcraft-1.12.2-0.13.7.03.jar

What version of Forge are you using?
14.23.5.2836

What version of Minecraft are you using?
1.12.2

What modpack and modpack version are you using, if any?
A homebrew. Currently trying to debug it.

Paste a link to your log or crash report here. Use a service like pastebin. No images, please.
https://gist.github.com/ArkenorOakshadow/ecf9b5f07c60fc31497593def700ec58

Describe the bug
The bit of the log in question is below. I've no idea if it's important, but I didn't much like the look of it and thought I'd better let you know.

[23:39:31] [Client thread/ERROR]: Error registering event handler: FMLMod:moremystcraft{0.5.5} class net.minecraftforge.client.event.ColorHandlerEvent public static void thefloydman.moremystcraft.proxy.CommonProxy.registerColors(net.minecraftforge.client.event.ColorHandlerEvent) java.lang.InstantiationException: null at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:48) ~[?:1.8.0_51] at java.lang.reflect.Constructor.newInstance(Constructor.java:422) ~[?:1.8.0_51] at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:130) [EventBus.class:?] at net.minecraftforge.fml.common.eventhandler.EventBus.register(EventBus.java:112) [EventBus.class:?] at net.minecraftforge.fml.common.AutomaticEventSubscriber.inject(AutomaticEventSubscriber.java:82) [AutomaticEventSubscriber.class:?] at net.minecraftforge.fml.common.FMLModContainer.constructMod(FMLModContainer.java:612) [FMLModContainer.class:?] at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) [guava-21.0.jar:?] at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) [guava-21.0.jar:?] at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) [guava-21.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:217) [guava-21.0.jar:?] at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:219) [LoadController.class:?] at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) [LoadController.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) [guava-21.0.jar:?] at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) [guava-21.0.jar:?] at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) [guava-21.0.jar:?] at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) [guava-21.0.jar:?] at com.google.common.eventbus.EventBus.post(EventBus.java:217) [guava-21.0.jar:?] at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:136) [LoadController.class:?] at net.minecraftforge.fml.common.Loader.loadMods(Loader.java:593) [Loader.class:?] at net.minecraftforge.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:232) [FMLClientHandler.class:?] at net.minecraft.client.Minecraft.init(Minecraft.java:467) [bib.class:?] at net.minecraft.client.Minecraft.run(Minecraft.java:3931) [bib.class:?] at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51] at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51] at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?] at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]

Is this causing any noticeable problems besides the error in the log?

Nothing obvious. But the problem could be an absence of something that's supposed to be there that I don't know about. Anyhows, it's not stopping me from playing. I just thought I'd let you know.